Shenzhen, in the southern Chinese province of Guangdong province, reached an environmental milestone at the beginning of 2019, with 99 per cent of its 21,689 taxis now powered by electricity. Photo: AP

Shenzhen, in the southern Chinese province of Guangdong province, reached an environmental milestone at the beginning of 2019, with 99 per cent of its 21,689 taxis now powered by electricity. Photo: AP